Is it no longer under warranty from Audient or the retailer? This is where I'd start if at all possible.
It certainly does not. It is a consumer-grade device with consumer-grade components and build quality. Nothing wrong with that, but it is not a professional-grade device. The good news is that products in the consumer tier have REALLY come a long way in the last decade or more.
Every audio interface by reputable manufacturers at this price point all do the same thing, they all sound roughly the same (minor differences in preamps being the most likely candidate with AD being a distant consideration for differences). The Audient is not some mythical device that offers more than what Focusrite, Presonus, MOTU, etc. are doing at this consumer tier.
Not sure if you're referring to the Audient iD22, but it is not a prosumer tier device.
Unfortunately, when I bought it, the warranty period was 1 year for the iD lineup. Now that the huge mess is seen and talked about by so many people they extended the warranty to three years as a faint attempt at cleaning up the mess a bit. To me, it doesn't mean a thing because I buy a device to use it not wait for it to come back from supposedly free of charge repair trips which are inevitable due to flawed design. I've read some horror stories where people had to wait for weeks if not months to get their device back from repair only to realize something else was wrong with it this time.
Audient iD series are not professional-grade devices, that's right. The reason I refer to iD22 as prosumer is because I've heard this numerous times on gear forums from more gear-oriented people. The reasoning behind it is AFAIK the preamps these guys used in the iD series are the same as their renowned flagship desks, the converters are great and the feature set of iD22 is not matched among its competitors. Plus some marketing mambo jambo mentioning world class Burr Brown converters (which have actually been TI converters since forever now). I'm not gonna list the full functionality here but it's more comprehensive for sure and a quick look at its specs would reveal it.
But yeah, aside from the capabilities of iD22 which are a bit hard to find in the < $500 territory and the beautiful sound, execution of the design and the quality of the components clearly mark it as consumer-grade.